For Berkeley, pretty much all proposals involving a late graduation are denied. The only real exceptions are if that extended stay will be done at a different campus as part of a study abroad program or a campus exchange program. I can only assume that UCLA would be the same.
I believe that if your over units your still allowed to enroll during summer or at the UCLA extension so there really isn’t any danger of not getting your degree(s), but you pay extra in tuition costs (Non-UC rate) and don’t get the perks associated with being a student like amenity access and insurance.
Since Phil 31 is 4 units, the Physics series is 15 units, and the O-chem series is 23 units together adds up to 42 extra units outside of the 99 upper division units you would need to complete the double major, I think it’s very unlikely you’ll get the approval from both departments for the double major. It might be worth a shot though.